spring-boot的aop是如何进行管理的

从上面几章分析等着spring-aop的核心就是要加载AnnotationAwareAspectJAutoProxyCreator类

AopAutoConfiguration

我们看下它的内容：

@Configuration
//这里判断何时使用这个类
@ConditionalOnClass({ EnableAspectJAutoProxy.class, Aspect.class, Advice.class,
      AnnotatedElement.class })
@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
public class AopAutoConfiguration {

   @Configuration
   @EnableAspectJAutoProxy(proxyTargetClass = false)
   @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false", matchIfMissing = false)
   public static class JdkDynamicAutoProxyConfiguration {

   }

   @Configuration
   @EnableAspectJAutoProxy(proxyTargetClass = true)
   @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true", matchIfMissing = true)
   public static class CglibAutoProxyConfiguration {

   }

}

 

这个类是如何加载到内存中的了：

 

由于这个类型加载会加载EnableAspectJAutoProxy注解

而在下面我们可以看到：

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(AspectJAutoProxyRegistrar.class)
public @interface EnableAspectJAutoProxy {
   boolean proxyTargetClass() default false;
   boolean exposeProxy() default false;

}

 

接着往下看

class AspectJAutoProxyRegistrar implements ImportBeanDefinitionRegistrar {

   /**
    * Register, escalate, and configure the AspectJ auto proxy creator based on the value
    * of the @{@link EnableAspectJAutoProxy#proxyTargetClass()} attribute on the importing
    * {@code @Configuration} class.
    */
   @Override
   public void registerBeanDefinitions(
         AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {

      AopConfigUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(registry);

      AnnotationAttributes enableAspectJAutoProxy =
            AnnotationConfigUtils.attributesFor(importingClassMetadata, EnableAspectJAutoProxy.class);
      if (enableAspectJAutoProxy != null) {
         if (enableAspectJAutoProxy.getBoolean("proxyTargetClass")) {
            AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);
         }
         if (enableAspectJAutoProxy.getBoolean("exposeProxy")) {
            AopConfigUtils.forceAutoProxyCreatorToExposeProxy(registry);
         }
      }
   }

}